Passage Data · Check a report · Use it from your AI

City of Columbia

Sewage treatment plant, major discharger, Columbia, Tennessee. NPDES permit TN0056103, in force until Oct 31, 2028. Last 12 months: over a limit 18 times (last September 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (38 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 2 of 24 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 18 values over a limit
Period endingParameterReportedLimitOver by
November 2025SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
December 2025Nitrogen, ammonia total [as N], monthly average3.579 mg/L≤ 1.5 mg/L139%
January 2026Nitrogen, ammonia total [as N], monthly average1.737 mg/L≤ 1.5 mg/L16%
January 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
February 2026BOD, carbonaceous [5 day, 20 C], monthly average11.4 mg/L≤ 8 mg/L43%
February 2026Nitrogen, ammonia total [as N], monthly average5.229 mg/L≤ 1.5 mg/L249%
February 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
February 2026Solids, total suspended, daily maximum69 mg/L≤ 45 mg/L53%
February 2026Solids, total suspended, monthly average23.1 mg/L≤ 21 mg/L10%
February 2026Solids, total suspended, weekly average34.8 mg/L≤ 28 mg/L24%
March 2026Nitrogen, ammonia total [as N], monthly average4.369 mg/L≤ 1.5 mg/L191%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average8.5 mg/L≤ 8 mg/L6%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average10 mg/L≤ 8 mg/L25%
June 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026E. coli, daily maximum613.1 #/100mL≤ 487 #/100mL26%
July 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
August 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
September 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 21 mg/Lall year001
Solids, total suspendedweekly average≤ 28 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 1751 lb/dall year001
Solids, total suspendedweekly average≤ 2335 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]quarterly averagereport only (mg/L)all year001
Nitrogen, total [as N]quarterly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 5.25 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 7.9 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 292 lb/dall year001
Nitrogen, ammonia total [as N]weekly average≤ 438 lb/dall year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]rolling average≤ 150 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 487 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 24.5 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1460 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2043 lb/dall year001
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 12 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum> 12 %all year001
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINF1
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINF1

How strict are these limits?

Cited limits by parameter: Tennessee's rules and the federal ones.

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0056103 · MCP: https://passage-data.com/mcp